<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  body {
    height: 200vh;
    width: 200vw;
  }
</style>
<body>
  <div id="block1" style="height:100px;width:100px;background-color:antiquewhite">right click here</div>
  <div id="block2" style="height:100px;width:100px;background-color:aquamarine">right click panel</div>
</body>
<script src="./demo.js" type="module"></script>
</html>